Paper separation structure

ABSTRACT

A paper separation structure arranged in an office machine, comprising: a separating roller set having a separating roller and a shaft, and a pick roller arranged to correspond to the separating roller set and contacted with the separating roller set, wherein the separating roller has a roller frame, a shaft hole is formed in the roller frame for accommodating the shaft, and a rubber layer connected with the pick roller, the shaft hole has a narrow inner diameter at a middle of the shaft hole and a wide inner diameter at opposite ends of the shaft hole to form two swing spaces between the middle of the shaft hole and opposite ends of the shaft hole, the roller frame and the rubber layer are swung about a joint between the middle of the shaft hole and the shaft.

CROSS-REFERENCE TO RELATED APPLICATION

The present application is based on, and claims priority from, China Patent Application No. 202022714321.1, filed Nov. 20, 2020, the disclosure of which is hereby incorporated by reference herein in its entirety.

BACKGROUND OF THE INVENTION 1. Field of the Invention

This invention relates to a paper separation structure, and more particularly to a paper separation structure which makes the load of a separating roller even.

2. The Related Art

Conventional scanners transmit documents inward with the cooperation of separating rollers and pick rollers. However, the separating rollers and the pick rollers are manufactured with different degrees of tolerance, which will cause the separating rollers and the pick rollers fail to fit with each other perfectly. Although the manufacturing tolerance is very small, but when the separating rollers and the pick rollers are used for a long time, the force between the separating rollers and the pick rollers will become uneven, and eventually the separating rollers and pick rollers are damaged.

Therefore, it is necessary to provide a paper separating structure which makes the load of the separating rollers and the pick rollers even.

SUMMARY OF THE INVENTION

The objective of the present invention is to provide paper separation structure, and more particularly to paper separation structure which makes the load of the separating roller even.

A paper separation structure arranged in an office machine, comprising: a separating roller set having a separating roller and a shaft, and a pick roller arranged to correspond to the separating roller set and contacted with the separating roller set, wherein the separating roller has a roller frame, a shaft hole is formed in the roller frame for accommodating the shaft, and a rubber layer connected with the pick roller, the shaft hole has a narrow inner diameter at a middle of the shaft hole and a wide inner diameter at opposite ends of the shaft hole to form two swing spaces between the middle of the shaft hole and opposite ends of the shaft hole, the roller frame and the rubber layer are swung about a joint between the middle of the shaft hole and the shaft.

In a preferred embodiment, wherein the separation roller has two the roller frames, a connecting portion is connected between the roller frames, the shaft hole is formed in the connecting portion and penetrated through the roller frames.

In a preferred embodiment, wherein the shaft has a limiting ring which is larger than the wide inner diameter of the shaft hole for holding the roller frames and the connecting portion.

In a preferred embodiment, wherein the separating roller set has a frame which covers a top of the separating roller, a joint portion is extended downward from a lower surface of the frame and arranged in corresponding to the connecting portion for being contacted with the connecting portion, a tab is extended upward from an upper surface of the frame and arranged in corresponding to the joint portion, a spring is arranged on the tab, the spring applies a force to the frame to drive the separating roller to contact with the pick roller.

In a preferred embodiment, wherein a clamping block is extended outward and extended radially from the connecting portion of the separating roller, a clamping slot is recessed from the joint portion for holding the clamping block.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be apparent to those skilled in the art by reading the following description, with reference to the attached drawings, in which:

FIG. 1 is a perspective view of a paper separation structure in this invention.

FIG. 2 is an exploded view of the paper separation structure in this invention.

FIG. 3 is a perspective view of a roller frame in this invention.

FIG. 4 is a perspective view of a separating roller set in this invention.

FIG. 5 is another perspective view of the separating roller set in this invention.

FIG. 6 is a sectional view of the separating roller set along line VI-VI shown in FIG. 5.

FIG. 7 is a sectional view of the separating roller set along line VII-VII shown in FIG. 5, which shows a separating roller swung about a shaft.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the embodiments.

Referring to FIG. 1 and FIG. 2, the present invention discloses a paper separation structure 100 which is provided in an office machine, such as a scanner. The paper separation structure 100 includes a separating roller set 1 and a plurality of pick rollers 2.

Referring to FIG. 2 to FIG. 5, the separating roller set 1 comprises a separating roller 11 and a shaft 12. The separating roller 11 has two roller frames 111, a connecting portion 112 connected between the roller frames 111, and a shaft hole 113 penetrated the connecting portion 112 along an axis of the separating roller 11. The shaft hole 113 goes through the roller frames 111 and the connecting portion 112. Referring to FIG. 6 and FIG. 7 now, an inner diameter of the shaft hole 113 is increased gradually from a middle of the shaft hole 113 to opposite ends of the shaft hole 113. The inner diameter of the shaft hole 113 is narrow at the middle and is wide at the ends to form two swing spaces 114 between the middle of the shaft hole 113 and the ends of the shaft hole 113. When the shaft 12 passes through the shaft hole 113, and the shaft 12 is immovable or the shaft 12 is rotated about an axis itself only, the roller frames 111 and the connecting portion 112 can swing about the shaft 12 and swing towards any radial direction of the shaft 12. Furthermore, the roller frames 111 are swung toward opposite directions. The roller frames 111 are swung about a joint between the middle of the shaft hole 113 and the shaft 12.

Referring to FIG. 1 and FIG. 2, the shaft 12 is provided with a limiting ring 121, which is larger than diameters of the ends the shaft hole 113 of the shaft hole 113 for blocking an end of the roller frame 111 and keeping the roller frame 111 to be located on the shaft 12.

The pick rollers 2 are arranged below the separating roller set 1 and contacted with the separating roller set 1. The quantity of pick rollers 2 corresponds to the roller frames 111 of the separating roller set 1, and the pick rollers 2 are arranged in corresponding to the roller frames 111 of the separating roller set 1.

Referring to FIG. 1 and FIG. 2, the roller frames 111 of the separating roller set 1 are further provided with rubber layers 115, and the rubber layers 115 are contacted with the pick rollers 2 respectively.

The separating roller set 1 is provided with a frame 14, which covers a top of the separating roller 11 and the shaft 12. A joint portion 141 is extended downward from a lower surface of the frame 14 and arranged in corresponding to the connecting portion 112, a bottom of the joint portion 141 is contacted with the connecting portion 112 along an up-to-down direction. A tab 142 is extending upward from an upper surface of the frame 14 and arranged in corresponding to the joint portion 141. A spring 15 is arranged on the tab 142, opposite ends of the spring 15 are mounted in the scanner and the frame 14 respectively. The spring 15 applies a downward force to the frame 14, to drive the separating roller 11 moving toward the pick rollers 2 and contacting with the pick rollers 2.

A clamping block 1121 is extended outward and extended radially from the connecting portion 112 of the separating roller 11. A clamping slot 1411 is recessed from the bottom of the joint portion 141 for holding the clamping block 1121. So that the joint portion 141 can be securely connected to the connecting portion 112.

Referring to FIG. 6 and FIG. 7, the manufacturing tolerances of the pick rollers 2 will cause surfaces of the pick rollers 2 to be uneven. However, the swing space 114 in the shaft hole 113 enables the separating roller 11 to swing about the joint between the middle of the shaft hole 113 and the shaft 12. Therefore, the separating roller 11 can be aligned with the pick roller 2 and tightly connected the pick roller 2 by deflection of the separating roller 11.

In summary, the paper separation structure 100 in this invention generates deflection of the separating roller 11 with the swing space 114 formed in the shaft hole 113, and the deflection aligns the separating roller 11 to the pick roller 2. Therefore, the separating roller 11 can rotate appropriately with the pick roller 2 to prevent the separating roller 11 from being damaged due to uneven force. 

What is claimed is:
 1. A paper separation structure arranged in an office machine, comprising: a separating roller set having a separating roller and a shaft, and a pick roller arranged to correspond to the separating roller set and contacted with the separating roller set, wherein the separating roller has a roller frame, a shaft hole is formed in the roller frame for accommodating the shaft, and a rubber layer connected with the pick roller, the shaft hole has a narrow inner diameter at a middle of the shaft hole and a wide inner diameter at opposite ends of the shaft hole to form two swing spaces between the middle of the shaft hole and opposite ends of the shaft hole, the roller frame and the rubber layer are swung about a joint between the middle of the shaft hole and the shaft.
 2. The paper separation structure as claimed in claim 1, wherein the separation roller has two the roller frames, a connecting portion is connected between the roller frames, the shaft hole is formed in the connecting portion and penetrated through the roller frames.
 3. The paper separation structure as claimed in claim 2, wherein the shaft has a limiting ring which is larger than the wide inner diameter of the shaft hole for holding the roller frames and the connecting portion.
 4. The paper separation structure as claimed in claim 2, wherein the separating roller set has a frame which covers a top of the separating roller, a joint portion is extended downward from a lower surface of the frame and arranged in corresponding to the connecting portion for being contacted with the connecting portion, a tab is extended upward from an upper surface of the frame and arranged in corresponding to the joint portion, a spring is arranged on the tab, the spring applies a force to the frame to drive the separating roller to contact with the pick roller.
 5. The paper separation structure as claimed in claim 4, wherein a clamping block is extended outward and extended radially from the connecting portion of the separating roller, a clamping slot is recessed from the joint portion for holding the clamping block. 